package com.example.day09;

/**
 * @author Lenovo
 */
public class StudentManager {
    public static void main(String[] args) {
        ArrayList<Student> array = new ArrayList<Student>();
        while (true){
            System.out.println("--------欢迎来到学生管理系统--------");
            System.out.println("1 添加学生");
            System.out.println("2 删除学生");
            System.out.println("3 修改学生");
            System.out.println("4 查看所有学生");
            System.out.println("5 退出");
            System.out.println("请输入你的选择：");
            Scanner sc = new Scanner(System.in);
            String line = sc.nextLine();
            switch (line){
                case "1":
                    addStudent(array);
                    break;
                    case "2":
                        deleteStudent(array);
                        break;
                        case "3":
                            updateStudent(array);
                            break;
                            case "4":
                                findAllStudent(array);
                                break;
                                case "5":
                                    System.out.println("欢迎下次使用");
                                    System.exit(0);
            }

        }
    }
    public static void addStudent(ArrayList<Student> array){
        Scanner sc = new Scanner(System.in);
        String sid;
        while (true){
            System.out.println("请输入学生id：");
            sid = sc.nextLine();
            boolean flag = isUsed(array, sid);
            if (flag) {
                System.out.println("你输入的学号已经被占用，请重新输入");
            } else {
                break;
            }
        }

        System.out.println("请输入学生姓名：");
        String name = sc.nextLine();

        System.out.println("请输入学生年龄：");
        String age = sc.nextLine();

        System.out.println("请输入学生居住地：");
        String address = sc.nextLine();
        Student s = new Student();
        s.setSid(sid);
        s.setName(name);
        s.setAge(age);
        s.setAddress(address);
        array.add(s);
        System.out.println("添加学生成功");
        }
        public static boolean isUsed(ArrayList<Student> array,String sid){
        boolean flag = false;
            for (int i = 0; i < array.size(); i++) {
                Student s = array.get(i);
                if (s.getSid().equals(sid)){
                    flag = true;
                    break;
                }
            }
            return flag;
        }
    public static void findAllStudent(ArrayList<Student> array){
        if (array.size() == 0) {
            System.out.println("无信息，请先添加信息再查询");
            return;
        }
        System.out.println("学号\t\t姓名\t\t年龄\t\t居住地");
        for (int i = 0; i < array.size(); i++) {
            Student s = array.get(i);
            System.out.println(s.getSid() + "\t\t" + s.getName() + "\t\t" + s.getAge() + "\t\t" + s.getAddress());
        }
}
    public static void deleteStudent(ArrayList<Student> array){
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入要删除学生的学号：");
        String sid = sc.nextLine();
        int index = -1;
        for (int i = 0; i < array.size(); i++) {
            Student s = array.get(i);
            if (s.getSid().equals(sid)) {
                index = i;
                break;
            }
        }
        if (index == -1) {
            System.out.println("查无此人");
        } else {
            array.remove(index);
            System.out.println("删除成功");
        }
    }
    public static void updateStudent(ArrayList<Student> array){
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入要修改学生的学号：");
        String sid = sc.nextLine();
        System.out.println("请输入学生新姓名：");
        String name = sc.nextLine();
        System.out.println("请输入学生新年龄：");
        String age = sc.nextLine();
        System.out.println("请输入学生新居住地：");
        String address = sc.nextLine();
        Student s = new Student();
        s.setSid(sid);
        s.setName(name);
        s.setAge(age);
        s.setAddress(address);
        for (int i = 0; i < array.size(); i++) {
            Student student = array.get(i);
            if (student.getSid().equals(sid)) {
                array.set(i, s);
            }
        }
        System.out.println("修改成功");

            }
}
